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Unexpected Execution Time/ Events proceeding increased [message #50741]

Tue, 17 January 2006 09:34

test
Messages: 51
Registered: July 2009

Member

Hi,

I've profiled the Carmodel example, which i modified a little bit, with
the 'Execution Time Analysis'. For this test i used TPTP 4.1.0.

The calling of one method (creating approximately 600.000 objects) needs
normally 220ms.

Problem:
A1.Start the CarModel main() method and connect to Agent Controller
(-XrunpiAgent:server=enabled)
A2.Attach Java Process to this Agent and Start Monitoring.
A3.Create the objects

The Creating of the 600.000 objects now takes 57 seconds and the profiler
proceeded 1.200.000 events.
Why are so many events proceeded by the profiler??

The problem occurs not, if i do:
1. A1.
2. A3.
3. A2.
4. A3 again.

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Re: Unexpected Execution Time/ Events proceeding increased [message #50918 is a reply to message #50741]

Thu, 19 January 2006 09:52

Samson Wai
Messages: 46
Registered: July 2009

Member

Hi Steffen,

The Java profiler has to construct and populate an internal hash table
immediately after the JNI call JVM_OnLoad() during JVM starts up. The JVMPI
classDef, methodDef, and objAlloc events are usually being generated during
the program load and this might take a comparatively "significant" amount of
time to create the associations in the profiler's internal hash table. This
expensive operation will be performed once for every Java object being
loaded. The hash table is later being used as references when
methodEntry/methodExit events are received. That is why you see a more
accurate result if you attach to the profiling agent after the objects have
been created since the object entry has already been entered into the
profiler's internal hash table.

Samson

"Steffen K

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